1/* Copyright (C) 1995-2019 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>. */
17
18#include <errno.h>
19#include <limits.h>
20#include <sys/time.h>
21#include <sys/timex.h>
22
23#define MAX_SEC (INT_MAX / 1000000L - 2)
24#define MIN_SEC (INT_MIN / 1000000L + 2)
25
26#ifndef MOD_OFFSET
27#define modes mode
28#endif
29
30#ifndef TIMEVAL
31#define TIMEVAL timeval
32#endif
33
34#ifndef TIMEX
35#define TIMEX timex
36#endif
37
38#ifndef ADJTIME
39#define ADJTIME __adjtime
40#endif
41
42#ifndef ADJTIMEX
43#define NO_LOCAL_ADJTIME
44#define ADJTIMEX(x) __adjtimex (x)
45#endif
46
47#ifndef LINKAGE
48#define LINKAGE
49#endif
50
51LINKAGE int
52ADJTIME (const struct TIMEVAL *itv, struct TIMEVAL *otv)
53{
54 struct TIMEX tntx;
55
56 if (itv)
57 {
58 struct TIMEVAL tmp;
59
60 /* We will do some check here. */
61 tmp.tv_sec = itv->tv_sec + itv->tv_usec / 1000000L;
62 tmp.tv_usec = itv->tv_usec % 1000000L;
63 if (tmp.tv_sec > MAX_SEC || tmp.tv_sec < MIN_SEC)
64 return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);
65 tntx.offset = tmp.tv_usec + tmp.tv_sec * 1000000L;
66 tntx.modes = ADJ_OFFSET_SINGLESHOT;
67 }
68 else
69 tntx.modes = ADJ_OFFSET_SS_READ;
70
71 if (__glibc_unlikely (ADJTIMEX (&tntx) < 0))
72 return -1;
73
74 if (otv)
75 {
76 if (tntx.offset < 0)
77 {
78 otv->tv_usec = -(-tntx.offset % 1000000);
79 otv->tv_sec = -(-tntx.offset / 1000000);
80 }
81 else
82 {
83 otv->tv_usec = tntx.offset % 1000000;
84 otv->tv_sec = tntx.offset / 1000000;
85 }
86 }
87 return 0;
88}
89
90#ifdef NO_LOCAL_ADJTIME
91weak_alias (__adjtime, adjtime)
92#endif
93